The frequency source is an important part of the receiver and has a significant impact on receiver performance.In this paper,the design of a C band agile frequency source is introduced,the design principle and simulation are given,and the system integration is carried out. Finally,a C band frequency module is fabricated. The test results show that the output frequency of the frequency synthesizer module is 4.0~8.0 GHz,the output amplitude is greater than 5 dBm,the phase noise is better than -102 dBc/Hz@10 kHz,the frequency changing speed is less than 10 μs,and the stray suppression is greater than 70 dB,the module has good environmental adaptability,and the main performance specifications meet the design requirements.The offtheshelf receiver modules have been fabricated,which have produced over 2 000 blocks in batch production and has been applied to many engineering projects,resulting in better economic and social benefits.